PSI - Issue 25

P.N. Lymperopoulos et al. / Procedia Structural Integrity 25 (2020) 172–179

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6 Panagiotis N. Lymperopoulos, Efstathios E. Theotokoglou, Ioannis A. Antoniadis / Structural Integrity Procedia 00 (2019) 000–000 In the sequel, applying a constant displacement (15mm) at the nodes on the top of a pentamode, in the case that the bottom nodes are fully constrained, the ratio G c G r is calculated . The height of the simulated pentamode, is 2 ∗ a. Two cases are studied, one for the steel material and the second for the polymer material. At first, from the finite element analysis, the F h has been calculated. Taking into consideration equation (3), and the G r value from Fabbrocino et.al. (2015), the ratio G c G r is calculated and it is presented in the two following Figures (6), (7).

Fig. 6. Calculation of G c

G r , Material : Steel

Fig. 7. Calculation of G c

G r , Material : Polymer